Hitze Insights
Piping & Heating Technical Guides
Specification, certification and sourcing guides for wholesalers, contractors and private-label brands — written from the Hitze engineering desk.
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Fiber Reinforced PPR Pipe vs Standard vs PPR-AL-PPR: What to Specify
Fiber reinforced PPR pipe falls under ISO 21003, not ISO 15874 — and 0.035 mm/m·K is a published minimum, not a property.…
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PPR Pipe Factory Audit: 8 Numbers to Check Before You Order
The plant manager walks you past a wall of framed certificates, then stops at a rack of blue pressure-test benches and says…
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PP-R Joint Failure: Proving Whether It Was the Pipe or the Weld
ISO 15874 separates a PP-R material defect from a bad weld. A step-by-step evidence procedure for importers and distributors facing a joint…
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Antibacterial PPR Pipe: What to Demand Before You Specify It
What ISO 22196 and JIS Z 2801 really measure, why lab coupon results do not predict a circulating riser, and the 8…
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Virgin vs Recycled PPR Pipe Material: What Buyers Can Verify
The ISO 15874 clause that governs recycled content, the melt flow rate limits that expose blending, and the four documents to request…
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PPR Fittings List to BOQ: Counting Pipe, Fittings and Waste
PPR fittings list to BOQ: the NRM2 rule on whether fittings are priced at all, the four count triggers, fusion-depth pipe loss,…
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PPR Pipe vs PEX: What to Specify for Hot Water
PPR pipe vs PEX judged on the same ISO 10508 service class, not brochure numbers — the PEX code digit and PP-R…
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PPR Pipe Support Spacing & Thermal Expansion for Hot Runs
PPR pipe support spacing by pipe size and wall temperature, the vertical 1.2 correction, and expansion-loop sizing worked from real manufacturer tables.
Read guide →PPR Pipe Pressure Test: Correct Pressure, Duration, Record
Test PP-R at 1.1x design pressure, not 1.5x its PN class. EN 806-4 procedures, why the gauge falls without a leak, and…
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PPR Pipe Flow Rate Chart: Size a Line Without Losing Pressure
PP-R flow rate chart from ISO 15874-2 Table 5 bores: pressure drop per metre and EN 806-3 velocity limits, for specifiers sizing…
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